[W126 Coupe] Low Idle and shut off problems. 1987 560 SEC

[MS. J]

First, I have found the forum very very helpful.  But I am still a little confused.  I am having cold start, low idle and stalling/ shut off problems.  
   
  I have read the archives re: Ignition control valves, and checking fuel filters, relays and OVP relay. 
   
  I have searched various locations to find out what the various parts look like, but not where to find them in my model.
   
  When putting the car in reverse it shuts off. I concluded a vacuum leak.  I have linked a few of the vacuum lines that were open and one that is located behind the engine I linked up but not sure if I connected in the right place.   To locate that one,  I had to remove the air filter housing to reach it behind the engine, it  travels down under fire wall area.  That seem to help the low idle a little (still way to low) but not the shut off when in reverse, and from start up in low idle. 
   
  I want to change the fuel filter but haven't located it yet. I am also going to change the spark plugs,  wires and not sure if I need to change distributor. How can I can if it needs replacing? I read that I should check the ignition control valve, but not sure it is located. 
   
  Can someone point me in the right direction? 
   
  Crystal 
  1987 560 SEC 
  Los Angeles 

       
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